Half to horace p



(No ModeI.) 2 Sheets-Sheet 1.

D. F. STAYMAN.

BALANCED ROTARY VALVE.

No. 439,608. Patented 0013.28, 1890.

us A IIII llllm UNITED STATES PATENT OFFICE.

DAVID F. STAYMAN, OF MIFFLINBURG, PENNSYLVANIA, ASSIGNOR OF ONE- HALF TO HORACE P. GLOVER, OF SAME PLACE.

BALANCED ROTARY VALVE.

SPECIFICATION forming part of Letters Patent No. 439,608, dated October 28,1890.

Application filed July 9,1890. Serial No. 358,190.

To all whom it may concern:

Be it known that. I, DAVID F. STAYMAN, a citizen of the United States, residing at Mifflinbnrg, in the county of Union and State of Pennsylvania, have invented a new and useful Balanced Rotary Valve, of which the following is a specification.

The invention relates to improvements in balanced valves.

The object of the present invention is to provide a perfectly-balanced valve adapted to be readily used in various kinds of engines and capable of freely exhausting and cansing no back-pressure.

r 5 Furthermore, the object of the inventionis to provide a valve in which there will be but little friction, and in which the steam-ports will be very short, and there will be a continual supply of steam close to the piston, and

which will admit of close regulation.

The invention consists of the construction and novel combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings, and pointed out in the claims hereto appended.

1n the drawings, Figure 1 is a perspective view of the valve constructed in accordance with this invention. Fig. 2 is a horizontal sectional view. Fig. 3 is a central vertical o sectional view. Fig. & is a detail perspective view of the valve proper. Fig. 5 is asectionalview on line 5 5 of Fig. 2. Fig. 6 isa reverse plan view of the valve-chest.

Referring to the accompanying drawings,

1 designates a cylindrical valve-chest having arranged within it a valve 2 and provided at its ends with heads and 1, which are bolted to the chest in the usual manner, and the head 3 is provided with a central opening 5, through which passes a valve-rod 6 and around which is arranged a stuffing-box 7, and the head 4 is provided with a centrally-arranged bearing-recess 8 in its inner face to receive a journal 9 of the valve 2. The valve 2 is cylindrical and is arranged within the chest and finds bearing on the inner face of the latter, and the journal 9 and the valve-rod 6 are journaled in the heads 3 and 4, and it will be seen that the valve 2 is mounted within the chest with great nicety and precision, and to (No model.)

facilitate adjustment the set-screw 10 and the adjustable collar 11 are provided and arranged at the ends or heads of the chest. Steam is admitted through the port 12, arranged at the top of the chest and midway the length there- 5 5 of, and passes through the steam-port 13 of the valve to a central chamber 14, formed by inclined partitions or diaphragms 15, arranged equidistant of the ends of the valve, and the bottom of the valve2 is provided with steamports 16 and exhaust-ports 17, arranged, respectively, adjacent to the inner and outer faces of the diaphragms or partitions 15, and being adapted to alternately register with diagonal chest-ports 18, communicating with the steam-cylinders 19, and by an oscillation of the valve a steam-port 16 is made to register with one of the ports 18, and steam is admitted to one of the cylinders, and simultaneously with this operation the exhaust-port 7o 17 at the other end of the valve is made to register with the adjacent port 18, and steam is allowed to exhaust freely into the pipe 20, whence it is carried off bya suit; ble pipe 21, and the ends of the valve, or that portion beyond the diaphragms or partitions 15, are open to permit free exhaustion of steam, and there is absolutely no back-pressure, and it has been found by experiment that if the valve is perfectly balanced and under a hundred pounds of pressure in the inner chamber 1 1 the valve can be moved by hand, it being only necessary to overcome the slight friction caused by the weight of the valve.

The valve by its oscillation causes either its steam-port 16 or its exhaust-port 17 to register with the adjacent port 18 of the chest, and it will readily be seen that the valve might be moved longitudinally and act as a balanced slide-valve, it being only necessary to make slight mechanical changes, which would readily suggest themselves, and which it is unnecessary to illustrate in the accompanying drawings.

The steam is admitted to the valve through 5 the top of the chest on the side opposite the ports 18, and the port 13 of the valve is continually in communication with the steamport 12 of the chest, and the steam after passing into one of the cylinders is exhausted at the end of the valve, passing into the pipe 20, and being carried off by the pipe 21, and it will be seen that the steam-ports are exceedingly short and there is a continual supply of steam close to the piston.

The valve has been illustrated as applied to a double-cylinder engine, but it is equally applicable to various kinds of engines, and I desire it to be understood that I do not confine myself to the precise details herein shown and described, as I may, without departing from the spirit of the invention, make minor changes therein, such as adapting the valve to the diiterent kinds of engines.

It will be seen that the exhaust-cavities formed by the open ends of the cylinder are in direct communication with the exhaustpipe 20, which is arranged parallel with the chest and upon one side thereof, and has its ends 22 communicating with exhaust-ports 23, arranged at the end of the chest, and by this means the steam which is exhausted is readily and freely carried oif through the pipe 20 and the pipe 21, which is arranged intermediate of the ends of the pipe 20, and there is no back-pressure and the pressure upon the valve will be the same at both ends and will readily equalize and render the valve perfectly balanced.

\Vhat I claim is 1. In a balanced valve, the combination of the cylindrical valve-chest provided with diagonal ports, and the cylindrical valve arranged within the chest and having the central steannchamber 14, and the exhaust-cavities arranged at its ends and provided at each end with diagonal ports, whereby the valve is adapted to be operated by a rotary or sliding motion, substantially as described.

2. In a balanced valve, the combination of the valve-chest and the valve arranged within the chest and provided with the partitions or diaphragms 15, arranged equidistant of the ends of the valve and having suitable ports, substantially as described.

3. In a balanced valve, the combination of the valve-chest having a steam-port 12 for the entrance of steam and provided with the diagonal ports 18, communicating with the steam-cylii'iders, and the cylindrical valve arranged within the valve-chest and provided with valves or partitions 15, arranged equidistant of the ends of the valve and forming a central steam-chamber 14, and exhaust-cavities at the ends of the valve, said valve being provided with steam and exhaust ports arranged diagonally and adapted to register alternately with the said as described.

I. In a balanced valve, the combination of the valve-chest provided at its top with the steaurentrance port 12, and having the steamports 18 extending diagonally across its bot tom and communicating with the steam-cylinders, and the cylindrical valve arranged within the valve-chest and provided with inclined diaphragms or partitions arranged equidistant of the ends of the valve and forming a eentrally-arranged steam-chamber, and exhaust-cavities arranged at the ends of the valve, said valve being provided with diagonal exhaust and steam ports 16 and 17, arranged parallel with each other upon opposite sides of the partitions or diaphragms and adapted to alternately register with the said ports 18, substantially as described.

5. In a balanced valve, the combination of the valve-chest provided at its top with the steam-entrance port 12 and at its bottom with the steam-ports 18, extending diagonally across its bottom and provided with the exhaust-ports 23, arranged at one side of the chest and at the ends thereof, the exhaustpipe having its ends communicating with the exhaust-ports, the pipe 21, communicating with the exhaust-pipe at a point intermediate of the ends of the latter, and the cylindrical valve arranged Within the valve-chest and provided with inclined diaphragms or partitions arranged equidistant of the ends of the valve and forming a centially-arranged steam-chamber, and exhaust-cavities arranged at the ends of the valve, said valve being provided with diagonal exhaust and steam ports 16 and 17, arranged parallel with each other upon opposite sides of the partitions or diaphragms and adapted ,to alternately register with the said ports 18, substantially as described.

6. A balanced oscillating or sliding valve provided with a cylindrical valve 2,]1avinga central steam-chamber 14, and exhaust-cavities arranged at the ends of the valve, the said chamber and cavities being separated by transverse partitions, substantially as described.

In testimony that I claim the foregoing as my own I have hereto afiixed my signature in presence of two witnesses.

DAVID F. S'IAYMAN.

ports 18, substantially \Vitnesses:

.Lvo. W. LINCOLN, B. F. EATON. 

